Burner for natural gas



March 11, 1930. WQ cEQY 1,750,616

' mURuEfi'FFoR NATURAL GAS F1195 j Jan. 10, 1929 I INVENTUR PIN ATTORNEYPatented Mar. 11, 1930 UNITED STATES Ufdl [SHI'CI PATENT OFFICE PHILIPW. MCCOY, OF TOLEDO, OHIO, ASSIGNOR TO THE SURFACE COMBUSTION COM- PANY,INQ, OF TOLEDO, OHIO, A CORPORATION OF NEW YORK BURNER FOR NATURAL GASApplication filed January 10, 1929. Serial No. 331,541.

This invention relates to improvements in gas burners and moreparticularly to gas burners adapted to burn premixed natural gas andair.

The invention has for its object to provide a burner of the characterindicated which shall not back-fire through the burner feed passagesinto the mixture supply manifold regardless of how low the turn-down maybe and which shall not blow ofl at the tip when the burner is operatingat maximum capacity regardless of such factors as would ordinarily causethe flame to blow off.

Referring to the drawings wherein the preferred embodiment of theinvention is illustrated Fig. 1 is an axial section through the burner;

Fig. 2 is a bottom plan view thereof; and

Fig. 3 is a radial cross section through the burner.

In the drawings, 10 indicates a cylindrical plug surrounded by andsupported in a tubular body 12 in a manner to form an annular feedpassage 14 for the mixture to be burned. One end of the body 12 isexteriorly threaded as at 16 to permit the burner to be screwed into amanifold not shown. The plug 10 extends into a relatively shallow wellor pit of considerably greater diameter than the bore in which the plug10 is positioned. Projecting radially from the top of the plug 10 is aflange or baflle 20, the rim thereof being in spaced relation withrespect to the sides and bottom of the well whereby an open path isformed between the feed passage 14 and the well 18. The underside of thebaffle 20 is preferably concave as at 22 and the bottom of the wellpreferably slopes upwardly and outwardly from the feed passage 14 asindicated at 24.

The plug is maintained in concentrically spaced relation with respect tothe bore of the body 12 in any suitable manner as by means of spacerwires 26 which extend in parallelism with the axis of the plug. Tofacilitate assemblage of the parts, the wires are preferably bent into Uform, the bottom of the U being disposed across the bottom of the plugand the plug forced into the bore of the member 12 as will be readilyunderstood. Instead of using wires for the purpose aforesaid, there maybe provided either on the plug or on the interior of the bore radiallyextending ribs 26 arranged in parallelism with the axis of the plug aswill be readily understood. The feed passage 14 is made sufiicientlysmall to prevent back flash or flame propagation therethrough un der anyconditions of operation of the burner. A cross pin 28 is preferablyprovided to prevent any possibility of relative axial displacementbetween the plug and the member 12.

Both the plug and the body 12 are preferably formed of a resisting alloyin order to more effectually withstand the high temperatures produced bythe burning of the gaseous mixture.

The mode of operation of the burner is substantially as follows: Thenatural gas and air are premixed in any suitable manner by apparatus notshown and the mixture delivered under pressure to the inlet of theburner below the plug 10. The mixture enters the annular passage 14 andimpinges against the underside of the baffle 20. The curvature of thebaffle directs the mixture impinging thereagainst toward the slopingfloor of the pit with the result that sufficiently violent swirling andagitation is set up in the mixture, to cause the mixture to completelyfill the pit instead of leaving the pit in the form of a tube as itotherwise would. The result is that when the mixture is ignited theflame tends to hug the burner tip even though the differential pressurebetween the atmosphere and the mixture leaving the feed passage 14 isrelatively great. Blow-off of the flame is therefore practicallyimpossible under any conditions of operation. Back-flash cannot occurbecause the size of the passage 14 is too small to permit flamepropagation therethrough.

The mixture of fuel gas and air is such that a substantially perfectmixture is produced. That is to say, the air and gas are so proportionedthat there is suflicient air for complete combustion. Such mixtures burnwith a vary short bluish flame and unless the burner is properlydesigned, will blow-off at the slightest provocation. The present,burneris susceptible of operation over a relatively great range of turn-downand there is not the slightest tendency for the flame to blow off eventhough the mixture supply should be suddenly increased.

As previously stated, the burner finds its special utility withpreformed mixtures of air and natural gas.

What is claimed is:

l. A gas burner for premixed gas comprising a cylindrical plug, atubular body within which said plug is supported in close concentricallyspaced relation to provide an annular feed passage for emitting a thinannular sheet of the gaseous mixture to be burned, a radial battle onsaid plug against which the annular sheet impinges upon issuing fromsaid feed passage, and a relatively shallow well within which saidbattle is positioned in spaced relation with respect to the sides andbottom of the well.

2. A gas burner for premixed gas comprising a cylindrical plug, atubular body within which said plug is supported in close concentricallyspaced relation to provide an annular feed passage for emitting a thinannular sheet of the gaseous mixture to be burned, a radial battle onsaid plug against which the annular sheet impinges upon issuing fromsaid feed passage, and a relatively shallow well within which saidbafile is positioned in spaced relation with respect to the sides andbottom of the well, the underside of the baflie having a shallow recess.

3. A gas burner for premixed gas comprising a cylindrical plug, atubular body within which said plug is supported in concentricallyspaced relation to provide an annular feed passage for the gaseousmixture to be burned, a radial battle on said plug against which themixture impinges upon issuing from said feed passage, and a relativelyshallow well within which said battle is positioned in spaced relationwith respect to the sides and bottom of the well, the underside of thebaflie being concaved.

4. A gas burner for premixed gas comprising a cylindrical plug, atubular body within which said plug is supported in concentricallyspaced relation to provide an annular feed passage for the gaseousmixture to be burned, a radial battle on said plug against which themixture impinges upon issuing from said feed passage, and a relativelyshallow well within which said bathe is positioned in spaced rela tionwith respect to the sides and bottom of the well, the cylindricalportion of the plug continuing an appreciable distance into the well,the bottom of the well sloping upwardly and outwardly from beneath saidbaifie.

5. A gas burner for premixed gas comprising a. cylindrical plug, atubular body with in which said plug is supported in concentricallyspaced relation to provide an annular feed passage for the gaseousmixture to be burned, a radial battle on said plug against which themixture impinges upon issuing from said feed passage, and a relativelyshallow well within which said battle is positioned in spaced relationwith respect to the sides and bottom of the well, the bottom of the wellsloping upwardly and outwardly from beneath said battle, and theunderside of said battle being curved outwardly and downward ly so as totend to direct the impinging mixtulfi downwardly against the bottom ofthe we 6. A gas burner for premixed gas comprising a tubular body whichfor a portion of its length has a bore of one diameter and for anotherportion thereof has a bore of lesser diameter, a cylindrical plugpositioned within the smaller bore in concentrically spaced relation toprovide an annular feed passage for feeding a thin annular sheet of themixture to be burned, said cylindrical plug projecting an appreciabledistance into the larger bore, a radial battle on the end of saidprojecting portion of the plug, said baflle being spaced from itssurrounding walls to establish a flow passage for the mixture from saidfeed passage to the space above the baflle.

In'testimony whereof I affix my signature.

PHILIP 7M. MCCOY.

